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2 Stroke Bicycle Engines & Kits 2 stroke engine kits need careful installation and setup, find out how from our professionals here!

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  #21  
Old 10-20-2010, 11:19 AM
wildworld wildworld is offline
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Default Re: are 2 stroke engine kits the same?

Finding out how to be a machinist building my motorized bicycle. Mostly remembering my schooling at uncle sam's expense.Satisfaction being self sufficient.This tech is before the big bikes. Rode my 50cc 2 -stroke 500 plus mi. all good weather all year .
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  #22  
Old 10-26-2010, 12:18 PM
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biknut biknut is offline
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Default Re: are 2 stroke engine kits the same?

I've been very happy with my 48cc kit from Zoom Bicycles, but when I say kit I mainly just mean the motor because I junked most of the cheap hardware from the kit and made my own.

This is the only kit I've owned but I would buy another one next time based on my experience so far.
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  #23  
Old 11-20-2010, 04:56 PM
jasonpadilla jasonpadilla is offline
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Default Re: are 2 stroke engine kits the same?

What is the best 2 stroke motor?
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  #24  
Old 11-21-2010, 08:43 PM
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GearNut GearNut is offline
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Default Re: are 2 stroke engine kits the same?

The best 2 stroke...... That's a trick question!
For putting in a bicycle I vote Morini.
Morini Franco USA
Franco Morini KickButt Engines
For brute power:
Worlds Biggest Engine@www.vincelewis.net
Technical data: Wärtsilä-Sulzer RTA96-C - Wikipedia, the free encyclopedia
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The_Aleman:
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.

Does not come with a fortune cookie."
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  #25  
Old 11-21-2010, 08:52 PM
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Goat Herder Goat Herder is offline
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Default Re: are 2 stroke engine kits the same?

The Morini rocks! http://motorbicycling.com/f23/new-fu...oxer-7689.html

http://i581.photobucket.com/albums/s...e/SNV32355.jpg

http://motorbicycling.com/attachment...t-p1010009.jpg

http://www.ozanmedia.com/new-ss-bike.jpg
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  #26  
Old 12-31-2010, 03:14 PM
KevXR KevXR is offline
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Default Re: are 2 stroke engine kits the same?

By "2 stroke engine kits" I assume you are limiting to the "inside the frame 2-stroke motors" that resemble motorcycle engines.

It would be nice to see a list of engine components from various vendors of the 2-stroke center mount motors. Motor, CDI, carb, etc.

Today, someone says, "Japanese motorcycle" and everyone thinks of Honda, Yamaha, Suzuki, or Kawasaki". Someone says, "Chinese motorcycle" and people think of a generic motorcycle made in China. Some of the motor companies in China have been making engines for Honda and Yamaha for decades. The quality is very high. What is really needed is brand recognition, so Chinese companies will defend their brand name. As people expect level quality from a known Chinese manufacture, for example Lifan, it will be easier to know you are getting what you paid for.

I've read more than a few posts where, "Bigger is better and more powerful" isn't panning out. Why is a 49cc motor outperforming an 80cc motor? The simple answers are quality and/or a motor / carb / CDI / exhaust that are designed as a package. Rather than just bumping up the displacement and dropping the motor in a shipping box.

I have a 200cc engine in my MX motorcycle that puts out 37 hp. (125cc road race engines can get over 40 hp.) Theoretically, a 49cc engine could be made to have enough power to tear apart most bicycle frames and rear wheels. But you'll never get that kind of "HP per 10cc" ratio with a $100 air cooled, non-power valved, no tuned expansion chamber motor. Long and short, quality can trump quantity.

Out in California, a deciding factor may just be the EPA (or CARB) stamp on the muffler.

Still looking around at the kits. I'll probably start with a friction drive kit as I have a nice 2-stroke motor sitting in my garage, but the "center mount 2-stroke kits" for about $150 are very tempting. And from motorcycle riding, I know it is possible to make a 2-stroke very very quiet.
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  #27  
Old 03-13-2011, 10:44 PM
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wayne z wayne z is offline
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Default Re: are 2 stroke engine kits the same?

I just bought and installed my 4th 66cc from BGF

This one came in a smallish box, with a big red bat logo and said "Red Bat Engine co" under the logo.
It's a straight head, not sure what bushing.

I was first suprised when I opened the box ans saw the best packing job ever! There was a freebie nylon zippered tote bag on top.
Under that, there was not one square inch of dead space showing anywhere, and with all those parts, nothing was touching any other part!
The packaging was definitly engineered.

The factory name on the motor sticker is "Nantong Jiali Gasoline Engine factory.
The quality control on this engine was good. I pulled all covers and checked all fasteners and didn't find any that werent tight enough,unlike my other ones.
Came with a nice cast intake manifold, and didn't find any resreictive welds in the exhaust.
No acorn nuts on the head studs is a good sign to me.
The gas tank is larger, and has 6mm studs instead of thost tiny ones I normaly see. Brass petcock.
Also, a 12 page users manual came with it. Very well transnslated, and very complete with illustrated parts brekdown and part numbers for engine and all the kit parts.
There's even photos on the back of an old tiller with a chinagirl engine on it.

I ran it for the first time today, ran good right off. Broke it in hard for bout 1 hr, uphill and back many times. Dropped the needle 1 notch and it's good.
This motor is a smoothie, some vibes when wound out, but WAY better than my last 3 engines.
This engine seems to have a stronger igniton too, It bump starts at way slower speed than my others need to make spark.


This "Red Bat" engine is the best I've seen so far.
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  #28  
Old 10-22-2011, 10:32 AM
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Dogtown Burner Dogtown Burner is offline
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Default Re: are 2 stroke engine kits the same?

Quote:
Originally Posted by jasonpadilla View Post
What is the best 2 stroke motor?
a similar question:
why are we here?...
better:
is Ford better than Chevy?
better yet:
what makes Women tick?..

haha that's a great question. one that most of us here on the board are still searching for. as you've seen on this thread, They all look the same, but there are significant internal differences. (after all, they are chinese....ooohh bad. sorry. too easy). anyway, things have really changed politically with the EPA, and the global economy as well. The result being- you never know what you're gonna get until you open the box. the kit will rarely look like the web picture, and it may be a slant, it may be an old straight that was buried on a shelf, discovered, and mailed to you. the supply is dodgy, and rumors of an all out embargo from the EPA has got prices and availability all over the map. From what I'VE read, the Morini is the grand daddy of them all, but best if ya got tons of cash you just HAVE to get rid of. the Raw is the best in the "66cc affordable" category. I'm curios what engines the "Motovelo" guys use. They look solid. and great aftermarket mods.

Last edited by Dogtown Burner; 10-22-2011 at 10:35 AM. Reason: spelling
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  #29  
Old 10-22-2011, 12:13 PM
roadstar05trent roadstar05trent is offline
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Default Re: are 2 stroke engine kits the same?

Quote:
Originally Posted by GearNut View Post
Break in the engine with 20:1 pre mix ratio. Use a quality pre mix oil made for motorcycles. Opti2, Amsoil, or Maxima brands come to mind.
Do NOT use pre mix oil made for outboard engines they are water cooled and have different requirements than air cooled engines.
Do not be afraid to go over 20 mph for SHORT bursts, like 100 yards or less, once in a great while.
It will actually help break in the piston rings better and faster.

Ride the engine for 15 minutes or so and then let it cool down completely, a 1/2 hour minimum.
I would ride it for 5 minutes and let it cool down. Then 10 minutes and cool down. Then 15 minutes and cool down, ect.
Long trips on an new engine will kill them if you do not let them cool down frequently.
Well I've been running Yamaha 2 stroke marine oil in both my motors from the start, no problems yet and have a few miles on the one, If the oil is good for a 12 to 15000 dollar motor it should be fine $170 one.
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  #30  
Old 10-22-2011, 12:47 PM
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GearNut GearNut is offline
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Default Re: are 2 stroke engine kits the same?

Outboard engines are water cooled. Compared to an air cooled engine the internal temperatures are lower and there are less hot spots. Air cooled engines require a differently formulated oil that can withstand the higher temperatures and provide the protection needed at the hot spots.
That is why the different oils are on the market. Each type is formulated to match the thermal requirements of the intended engine application.
In the end, you can run whatever oil you wish to. It is certainly better than no oil at all. If you want maximum protection and the longest life possible for your engine, I recommend using an oil that is designed for the needs of the engine you want to use it in.
__________________
The_Aleman:
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.

Does not come with a fortune cookie."
________________________
ROTFLMAO!!!!!!
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